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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8510cd6e50979602f98034b4a9b92d10ab26bcad67f5bf0402aca731efd1f4b' 
  AND token = 'Hj04xWmWqDtTnStEosDmwJ5ZiUx0uMD6c+2TEpTY2is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}